package com.th.filter;

import com.alibaba.fastjson.JSON;
import com.th.common.BaseContext;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import com.th.common.R;

/**
 * @ClassName: LoginCheckFilter
 * @Description: 检查用户是否已经完成登录
 * @author: 名字
 * @date: 2022/5/10  15:57
 */
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
	//发射点发射点法大师傅
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;


        String requestURI = request.getRequestURI();
        log.info("获取uri"+requestURI);
        //        定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        boolean check = check(urls, requestURI);
        System.out.println("check"+check);

        if(check){
            log.info("不需要处理的路径，放行"+requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        Long employee = (Long) request.getSession().getAttribute("employee");
        BaseContext.setCurrentId(employee);
        if(employee != null){
            log.info("登录了 （后台） ");
            filterChain.doFilter(request,response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    //路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            if(PATH_MATCHER.match(url, requestURI)){
                return true;
            }
        }
        return  false;
    }
}
